Direct answers on 397.3AU hazmat violations: OOS rates, enforcement trends, and what happens next after citation.
Ranks #2,664 of 3,146 FMCSR codes by citation frequency • OOS rate of 0.0% is below the FMCSR-wide average of 33.3%.
Failing to comply with Alliance for Uniform HM Registration requirements
Direct answers grounded in TruckCodex inspection data
No. Our inspection records show a 0.0% out-of-service rate for 397.3AU across all citations in our database. All 2 citations on record were not placed out of service. This is significantly lower than the 31.4% average OOS rate across all FMCSR codes, meaning this violation is typically treated as a citation rather than an immediate roadside removal.
397.3AU is among the least-cited hazmat violations. Our database shows only 2 all-time citations, ranking it #2651 of 3,036 FMCSR codes. Compare this to peer hazmat codes: 177.834A-HMC has 3,954 citations with a 99.2% OOS rate, and 172.602(c)(1) has 1,464 citations with a 0.0% OOS rate. 397.3AU falls at the lower end of enforcement volume within its hazardous materials category.
Enforcement is extremely rare. Our records show zero citations in the last 12 months and zero in the last 90 days, despite 2 all-time citations in our database of 13 million+ inspections. This suggests 397.3AU is either infrequently violated or no longer actively cited during roadside inspections. If you received a citation, contact your carrier's compliance team immediately for guidance on the specific violation cited.
Yes. The FMCSA DataQs program allows you or your carrier to challenge any roadside inspection finding within 90 days of citation. Submit through your carrier's Safety Management System (SMS) account or directly via the DataQs portal with evidence supporting your challenge. Documentation violations and equipment assessments are both contestable. Success depends on providing clear evidence that the violation did not occur or was incorrectly documented by the inspector.
Only 2 citations appear in our all-time records. WINCO TRUCKING LLC (USDOT 2126776) received 1 citation, and NORTHHAUL INC (USDOT 3978704) received 1 citation. Both citations were not placed out of service. Given the extreme rarity of 397.3AU enforcement, if your carrier has been cited, you are in a very small group.
Low urgency for operational impact, but address it promptly for your record. Zero citations in the last 90 days and only 2 all-time citations indicate this is not a high-priority enforcement area. However, because it falls under hazardous materials regulations, any hazmat compliance issue should be treated seriously at your carrier level. Resolve the underlying cause to avoid future citations, even if the immediate pressure is minimal.
TruckCodex aggregates official public-sector datasets. See the Source registry for dataset-level coverage and the Freshness log for last-import timestamps.
Census, SAFER, SMS, Licensing & Insurance (L&I), roadside inspections, crashes, and authority history.
Vehicle recall campaigns, defect investigations, and consumer safety complaints (SCRS).
Cross-border carrier registry and Canadian recall campaigns where applicable.
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